We investigated visual control of braking in the situation of decelerating behind a lead vehicle under normal driving conditions, without asking the subjects to make soft collisions with encountered obstacles. According to our research hypothesis – extending Fajen's (Fajen, B.R., 2005, Journal of Experimental Psychology: Human Perception and Performance, 31(5), 1107-1123) model for braking – both preferred headway and ideal deceleration are controlled during car-following. When moving obstacles are encountered , headway – final time gap from vehicle ahead at the ending of deceleration – is controlled, but when static obstacles are encountered, headway information is discarded, as it does not provide salient information for future collision avoidance. Subjects performed a simulated driving task in which subject vehicle absolute speed, lead vehicle size, and subject/lead vehicle relative speed were independently manipulated. Analysis focused on ideal deceleration at the onset of braking, and headway an the end of braking. A first account of optic variables used to specify preferred headway is presented, including distance, optical angle, expansion rate, and global optic flow rate (GOFR).
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|Data di pubblicazione:||2007|
|Autori:||Fiorani M.; Mariani M.|
|Titolo:||Visual guidance in car-following tasks|
|Appare nelle tipologie:||Abstract in Atti di Convegno|
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